Navegando por Assunto "Tide"

Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
As dimensões do risco hidrometeorológico na cidade de Vigia de Nazaré-Pa, Zona Costeira paraense
(Universidade Federal do Pará, 2022-06-30) BARRETO, Cairo Eduardo Carvalho; COHEN, Julia Clarinda Paiva; http://lattes.cnpq.br/0293299378753887; https://orcid.org/0000-0003-2048-8915; PIMENTEL, Marcia Aparecida da Silva; http://lattes.cnpq.br/3994635795557609; https://orcid.org/0000-0001-9893-9777
The city of Vigia de Nazaré, located in the Northeast of Pará, Estuarine Continental Sector of the Coastal Zone of Pará, has a historical problem of flooding, caused mainly by the effects of the tide, the rainy season with considerable accumulations of precipitation and incorporation of the fluvial-marine floodplains to the urban area. The general objective is to understand the relationship between the dynamics of floods and the occupation process in the city of Vigia de Nazaré-PA, producing a diagnosis of risk to extreme hydroclimatic events, considering temporal factors, as well as those of coastal dynamics, which in line with converge to the reality experienced by the local population. Therefore, it will be necessary to understand the process of occupation in the city of Vigia, mainly on the floodplain area, the dynamics of hydrometeorological phenomena and define the dimensions of the risk in Vigia, based on socio-environmental data. To produce the analysis, the research had data from the Centro de Hidrografia Marinha (CHM) were used, for tidal prediction, from the National Agency for Water and Basic Sanitation (ANA), to understand the seasonality of precipitation, and still, an aerial survey was carried out through a cooperation with the Management and Operational Center of the Amazon Protection System (CENSIPAM-CRBE), aiming at the production of a very high resolution Digital Terrain Model (MDT) to determine the area covered by the floodplain and an orthomosaic to visualize the urban features, among others. The socioeconomic (IBGE, 2010; IFDM, 2010) and health (DATASUS, 2014; 2016) data, in order to recognize the municipality's vulnerability to risk in relation to others in the coastal region, were adapted from another study, incorporating other health data, from a DATASUS source. Statistical and geoprocessing tools were applied to these data to compose the analyses. The main results found were: it is a historical problem, resulting from a socially constructed risk, accepted by the population and neglected by the public power; ⅓ of the occupation of the urban area is on the fluvial-marine plain, under the influence of the tide, with a large part of this area recently incorporated into the urban space, more strongly from the 1980s, in the context of the recent restructuring of the Amazon regional space. Its natural dynamics includes semi-diurnal tides, reaching 4.56 m; has an intense rainy season, for the regional characteristic of the eastern Amazon, with the highest accumulated precipitation in the months from January to May, between 307.1 mm and 489.9 mm, with the rainy quarter, FEB-MAR-ABR, passing 400 mm of rain and 25 days of average daily rainfall frequency (FDPRP). Still, there are records of flooding events affecting more than 4000 residences in the urban area, and these events were frequent during the researched historical series (1991-2020). The municipality still has a high socio-environmental vulnerability to risk, among the municipalities in the coastal region. These and other results can form a diagnosis on the hydrometeorological risk of the city of Vigia, providing subsidies for actions at various scales, whether environmental monitoring, disciplining and guiding land use and occupation, and also in investments in social areas and in the health in order to mitigate the effects of flood events.
Acesso aberto (Open Access)
Modelagem hidrodinâmica aplicada ao estuário amazônico: uma abordagem em malha flexível
(Universidade Federal do Pará, 2014-08-19) BORBA, Thaís Angélica da Costa; ROLLNIC, Marcelo; http://lattes.cnpq.br/6585442266149471
Amazonian Estuary is a very complex system due to its large number of water bodies; it also encompasses four of the 20 largest rivers of world. Several hydrodynamic models have been applied on this system, but its complexity on shape makes difficult the grid definition when curvilinear grid is used. This research aimed the implementation of hydrodynamic model on this, based in flexible mesh grid that is easier to define on this kind of systems than curvilinear grids, and analyze the hydrodynamic patterns within this estuary. The methodology is based on the use of D-Flow in which a flexible mesh can be defined. The model domain encompasses the low course of Amazon River, Tapajós River, Xingu River, Tocantins River, Guajará Bay, Marajó Bay, Breves Strait and Pará River as well as the flood plain area and the adjacent continental shelf. The model presents a quite good calibration values for tidal signal as well as discharge since the Pearson's correlation coefficient presented values bigger than 0.95 for both and rmse presented values smaller than 5% for the former and 15% for the latter. The model also performed well on representation of several scenarios that represented extreme conditions regarding tide and discharge sources of Amazonian Estuary and it showed expected patterns by comparison with in situ data.
Acesso aberto (Open Access)
Transporte de resíduos sólidos flutuantes em rios urbanos dominados por maré na região Norte do Brasil
(Universidade Federal do Pará, 2021-07-07) ROSA, Gabriel Pompeu; MONTEIRO, Sury de Moura; http://lattes.cnpq.br/4309806566068586; https://orcid.org/0000-0001-9449-7043
The rivers that cut through metropolises are considered important ways for the waste generated on the continents to be transported to the oceans. Estimates of waste flows in rivers in the Amazon coastal zone remain uncertain due to the influence of hydrodynamic processes (tide, currents and flow), and above all, the lack of data on the type and amount of solid waste floating in the rivers. Therefore, the main objective of this study was to quantify and estimate the fluctuating waste fluxes at different time scales in tidaldominated rivers of the Amazonian coastal zone. Visual quantification took place over 12 hours (6 to 6 pm) in the flood and ebb tide stages, in the dry and rainy periods, in the rivers Acará, Guamá, Guajará, Tucunduba and Tamandaré. The estimate of waste transport in different tidal stages and seasonal periods was calculated considering the amount of waste in a time interval (hour, month and year). A total of 19,654 solid waste was quantified in the rivers studied, 71% of which was plastic materials. The residues from the rivers that cut through Belém (Tucunduba and Tamandaré) are exported to the rivers that surround the capital, while in these rivers, the residues present a bidirectional flow, suggesting imprisonment reflecting the influence of hydrodynamic processes (tidal current and flow). This study presents the first estimate of transport in rivers on the coast of Pará based on real observations, indicating an estimate of annual transport that varies between 3 and 549 tons/year.